## Guest

Khimraj
3007 Points
3 years ago
work done in bringing
first charge = 0
second charge = Q*(potential due to already present charge) = Q*KQ/a = KQ2/a
third charge = Q*(potential due to already present charge) = Q*(KQ/a + KQ/$\sqrt{2}$)

fourth charge = Q*(potential due to already present charge) = Q*(2KQ/a + KQ/$\sqrt{2}$)
and total energy of system will be equal to sum of all above work done.